Quarterly report pursuant to Section 13 or 15(d)

Capital Stock Transactions - Narrative (Details)

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Capital Stock Transactions - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended
Aug. 31, 2018
Jun. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Mar. 31, 2018
Class Of Stock [Line Items]              
Series A convertible preferred stock authorized (in shares)     2,000,000   2,000,000   2,000,000
Series A convertible preferred stock, par value (in dollars per share)     $ 0.0001   $ 0.0001   $ 0.0001
Series A convertible preferred stock issued (in shares)     100,000   100,000   100,000
Total unrecognized stock base compensation expense     $ 2,194 $ 2,691 $ 2,194 $ 2,691  
Unvested stock options, weighted average period         2 years 5 days 2 years 14 days  
Equity Option              
Class Of Stock [Line Items]              
Options exercised (in shares)         316,784    
Restricted Stock              
Class Of Stock [Line Items]              
Granted (in shares)         539,213    
Restricted Stock | Minimum              
Class Of Stock [Line Items]              
Vesting period         3 months    
Restricted Stock | Maximum              
Class Of Stock [Line Items]              
Vesting period         2 years    
Non Vested Restricted Stock              
Class Of Stock [Line Items]              
Vesting period 1 year 3 years          
Granted (in shares) 306,655 232,558     539,213    
Fair value of shares on date of issuance $ 426 $ 400          
Total unrecognized stock base compensation expense     610   $ 610    
Unvested stock options, weighted average period         1 year 8 months 19 days    
Time Condition RSAs              
Class Of Stock [Line Items]              
Compensation expense     $ 123 $ 157 $ 365 $ 223  
Convertible Preferred Stock              
Class Of Stock [Line Items]              
Series A convertible preferred stock authorized (in shares)     2,000,000   2,000,000    
Series A convertible preferred stock, par value (in dollars per share)     $ 0.0001   $ 0.0001    
Series A convertible preferred stock issued (in shares)     100,000   100,000    
Aggregate shares upon conversion (in shares)         20,000    
Liquidation preference (in dollars per share)             $ 10